//===-- PTree.h -------------------------------------------------*- C++ -*-===//
//
//                     The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef __UTIL_PTREE_H__
#define __UTIL_PTREE_H__

#include <klee/Expr.h>

#include <cassert>
#include <iostream>
#include <utility>

namespace klee {
class ExecutionState;

class PTree {
    typedef ExecutionState *data_type;

public:
    typedef class PTreeNode Node;
    Node *root;

    PTree(const data_type &_root);
    ~PTree();

    std::pair<Node *, Node *> split(Node *n, const data_type &leftData, const data_type &rightData);
    void remove(Node *n);

    void dump(llvm::raw_ostream &os);

    void activate(Node *n);
    void deactivate(Node *n);
};

class PTreeNode {
    friend class PTree;

public:
    PTreeNode *parent, *left, *right;
    ExecutionState *data;
    ref<Expr> condition;
    bool active;

private:
    PTreeNode(PTreeNode *_parent, ExecutionState *_data);
    ~PTreeNode();
};
}

#endif
